<template>
  <div class="list" ref="wapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="btn-list">
          <div class="btn-wapper">
            <button class="btn">{{this.city}}</button>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="btn-list">
          <div class="btn-wapper" v-for="item in hotCities" :key="item.id">
            <button class="btn" @click="handleCityClick(item.name)">{{item.name}}</button>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list"
             v-for="innerItem of item"
             :key="innerItem.id"
             @click="handleCityClick(innerItem.name)">
          <div class="item border-bottom">{{innerItem.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { mapState, mapMutations } from 'vuex'
import BScroll from 'better-scroll'
export default {
  name: 'CityList',
  props: {
    hotCities: Array,
    cities: Object,
    letter: String
  },
  computed: {
    ...mapState(['city'])
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wapper, { click: true })
  },
  watch: {
    letter () {
      let element = this.$refs[this.letter][0]
      this.scroll.scrollToElement(element)
    }
  }
}
</script>
<style lang="stylus" scoped>
.border-topbottom
  &:before
    border-color #ccc
  &:after
    border-color #ccc
.border-bottom
  &:before
    border-color #ccc
.list
  position absolute
  top 1.58rem
  left 0
  right 0
  bottom 0
  overflow hidden
  .title
    background-color #eeeeee
    line-height .54rem
    padding-left .2rem
    color #666
    font-size .26rem
  .btn-list
    padding .1rem .6rem .1rem .1rem
    overflow hidden
    .btn-wapper
      float left
      width 30%
      margin 0 .1rem
      .btn
        width 100%
        margin .1rem
        padding .1rem 0
        text-align center
        border .02rem solid #ccc
        border-radius .06rem
        background-color #fff
  .item-list
    .item
      line-height .76rem
      padding-left .3rem
</style>
